question_answer

Why \[BaS{{O}_{4}}\] is insoluble whereas \[BeS{{O}_{4}}\]  is soluble in water?

Answer:

                The lattice enthalpy of \[BaS{{O}_{4}}\] is much more than its hydration enthalpy and hence it is insoluble in water. But hydration enthalpy of \[BeS{{O}_{4}}\] is much higher than its lattice enthalpy because of small size of \[B{{e}^{2+}}\] ions. Therefore, it is highly soluble in water.